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Thermogenic drugs for the treatment of obesity: screening using obese rats and mice
Abstract:
The thermogenic activity of ephedrine, ethinyloestradiol and triiodothyronine were compared by incorporating the drugs into the diets fed to groups of adult rats and mice. The animals used were normal lean mice, hypothalamic obese mice, dietary-induced obese mice and rats, and genetically obese mice and rats. Food intake and body weight were monitored throughout and oxygen consumption measurements were made. Finally, the animals were killed and their carcasses analysed. Generally, ethinyloestradiol reduced body weight by causing anorexia. Triiodothyronine increased oxygen consumption but also increased food intake such that in most cases body weight did not change; it killed the genetically obese animals, but reduced fat in the hypothalamic and dietary induced obese animals. The animals treated with ephedrine lost body weight and body fat without increasing food intake, and had elevated oxygen consumptions. This experiment not only demonstrated marked differences between the various laboratory animal models of obesity, but also that ephedrine is a potential slimming agent. It is relatively safe and has been used by us to obtain successful breeding using the genetically obese male animals which are normally sterile.
Insights
Ephedrine effectively reduced body weight and fat in obese animal models without increasing food intake, indicating its potential as a safe slimming agent. This study also highlighted differences in obesity models.
Area of Science:
- Pharmacology
- Obesity Research
- Animal Models
Background:
- Obesity is a complex metabolic disorder with various etiological factors.
- Understanding the thermogenic effects of different compounds is crucial for developing anti-obesity strategies.
- Various animal models exist to study obesity, each with unique characteristics.
Purpose of the Study:
- To compare the thermogenic activity of ephedrine, ethinyloestradiol, and triiodothyronine.
- To evaluate the efficacy of these compounds in different animal models of obesity.
- To assess the potential of ephedrine as a slimming agent.
Main Methods:
- Incorporation of drugs into the diets of adult rats and mice.
- Monitoring of food intake and body weight.
- Measurement of oxygen consumption and carcass analysis.
Main Results:
- Ethinyloestradiol reduced body weight primarily through anorexia.
- Triiodothyronine increased oxygen consumption but also food intake, with variable effects on body weight and fat.
- Ephedrine treatment led to body weight and fat loss with increased oxygen consumption, without affecting food intake.
- Significant differences were observed among the various obesity models studied.
Conclusions:
- Ephedrine demonstrated significant potential as a slimming agent, promoting fat loss and weight reduction.
- The study highlighted distinct responses to thermogenic agents across different animal models of obesity.
- Ephedrine proved safe and effective, even enabling successful breeding in normally sterile genetically obese male animals.